A heat wave is a prolonged period of excessively hot weather, which may be accompanied by high humidity. These events can last for several days or even weeks, significantly raising temperatures above the average for a specific region. Heat waves can occur in any season but are most common during the summer months. During a heat wave, the risk of heat-related illnesses, such as heat exhaustion and heat stroke, increases. Meteorologists use various criteria to define a heat wave, including temperature thresholds and the duration of high temperatures. Communities often implement safety measures to protect vulnerable populations during these extreme weather events.